Electrical connection.



J. M. ANDERSEN.

ELECTRICAL CONNECTION. APPLIOATION FILED r3345, 1912.

Patented May 14, 1912.

ATTORNEY.

IVITNESSES:

her is adapted to be insertedinter. socket member, substantially as shown and de-l UNITED STATES PATENT OFFICE.

J'OHAN M. ANDERSEN, 0F BOSTON, MASSACHUSETTS, ASSIGNOR TO ALBERT AND J. M.

ANDERSON MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPO- RATION OF MAINE.

Specification of Letters Patent.

ELECTRICAL CONNECTION.

Patented May 14., imz.

Application filed February 15,1912. Serial No. 677,727.

To all whom it mag concern: I i Be it known that I, J OHAN M ANbnz'zsnn,

a citizen of the United States,.-residing:-in I outer metal shell a, a sleeve 1; of insulation within the same, a metal sleeve 0 within Boston, county of -Sufi'o1k,' and State f Massachusetts, have invented 'an Ixtiprdiris ment in Electrical Connections, of whichthe following descriptidn inponnection with they accom anying drawings; isa specification;

like le ters on the drawings representing like parts. I w if,

This inventionrelatesto an electrica'hconnection of that class 'in which'a plugmen'ascribed in U. S. Patent No."985241 toime February 28, 1911. 4 i

I The present invention relates to the plug member of such connection and more articularly to the device employed to relieve the terminals from strain when the plug member is pulled out of its coiiperating socket member. i a

The present inventionhas" for its object to granted avoid injury to the insulat-ionfon the wires .ed' to engagethe end of thefnietal shell within the latter and to be secured tothej wires outside of said shell; whereby the insulation on the wires is prevented from coming in contactwith the' metal shell and from being 'cha'fed thereby-as'the plug member is bein carried by the operator grasping. the sai wires, while at the same time the terminals are relieved from strain. The device is ca:

pable of being applied todahe plug member after the wires have been connected to their, terminals, as will be described.

Figure 1 .is a longitudinal section of a plug member provided with a chafing device embodying this invention. Fig. 2 an end elevation of the plug member shown in Fig. 1 looking toward the left. Figs. 3 and 4 side and end elevations of the chafing device removed from the-plu' "member. Fi 5 a plan or one of the meni ers of the cha provided with device, and Fig. 6 a section on the line 6--6 .Fig

5. "The p ug member herein shown comprises the insulating sleeve 6 and supported by a cross'wall or portion 62 of insulationform- 1I1g part of the sleeve b, a central metal post or contactmember 0 also sup orted by the,

the'xenrlof the stud on port 6 and in a" boss 15 on the inner. side of the metal sleeve 'a and screws 16, 17Twhich1' secure said terminals to said post and sleeve respectively. The-electric conductorsor wires 72., z are provided withthe usual insulation 18, and are extended through a hole or opening in the head or. end wall 20 of the metal shell a, said end wall being shown in the'jpresent instance as removable from the -shellmand having a cylindrical extension 21, which is externally screw threaded to engage internal screw. threads on the said shell.

The insulated wires 77,41 are protected from abrasion by contactwith the walls of the opening in the head 20 of the metal shell,'by

a chafing device comprising two members 3.0, 31, of'like construction and each provided on its outer surface as herein shown with a transversely extended groove or channel 32, which forms at the'inner end of the member a bearing surface or flange 33, which'is designed to engage the inner surface of the end wall or head 20 and-thereby relieve the terminals 7 f, g from strain when the plug member is removed from the socket member. The members 30, 31 are longitudinall extended grooves 34 on their inner sur aces for the reception of the wires h, i, and are designed to be secured-in fixed relation to wires by means of screws 35 which pass through holes in onemember as 30 and into threaded sockets 36 inthe other member 31, and said men bersma-y and preferably will be provided on their inner-surfaces with projections or teeth 37 to bite; into the'insulation on the wires. The members of theuchjafing device are made with their flan ed ends of less diameter thanthe hole in t e head 20, so that the flangedxendsmay be readily inserted into the shell n .by t lting them andinserting the flanged end into the shell-until 10, the'insulation on thewi res'fcannot come in contact with the walls-of the ';opening in the end ofthe metal shell, and as a result chafing or cut-ting of the-insulation pre- 1 vented, and the danger j'ofijaccidents from defective insulation thereby. avoided, while ,lat the sametime, the terminals are protect-- ,ed from strain, when the plug member is H withdrawn 'from it's socket member, by the 1. operator pulling upon the wires, inasmuch 2Q fas this strain is transferredjby'the flanges 33 to tlieiinetal shell. a A plug of the character above described is used in stations, garages and-like places,

as for instance, where it is desired to charge 2 5: storage batterles on motor vehicles, and in such service the plug member is usually car- I 'ried about from one vehicle to. another by the operator grasping the insulated wires, which leave-s the plug member. free to swing 3'0 and thereby chafethe insulation in the absence of the presentinvention.

, I'have herein shown the anti-chafing device as used on one form of plug member which it may bepre'ferred to use, but it is 35 not desired to limit the invention in this respect as it is equally applicable to other forms of plug member in which the insulated wirespass out through the end of a hollow shell.

construction of the anti-chafing device herein shown, although this construction may be preferred.

It will be observed that the chafing device is capable of being applied to the wires after they are secured'to their terminals, which leaves the openingin the head 20 of the metal shell open for the insertion of a screw driver, whereby the wires may be inserted through the head. and secured to their terminals before the chafing device is applied to the wires.

Claims: p 1. The combination with the plug member of an electrical connection having a metal shell provided at its end with an opening Furthermore it is not de- 40 sired to-liinit the invention to the particular through which the electric conductors are passed, of acombined anti-chafing and strain relieving device comprising members extended through said opening into and outside ofsaid metal shell and provided with means for engaging said shell within the same, and means for securing said members in fixed relation to said conductors.

- 2. The combination with the plug member of an electrical connection. having a metal shell provided at its end with an opening through which the electric conductors are passed, of a combined anti-chafing and strain relieving device comprising members extended through said opening into and outside of saidmetal shell and provided .near the end within the said shell with transverse grooves for the reception of the walls of said opening and forming external flanges for engagement .with the walls of said opening.

within the said shell, substantially as .described.

An anti-chafing and strain relieving, device of the character, described comprising members having in their inner surfaces longitudinally extended. grooves and projectionsor teeth within. said grooves and pro-' vided on their outer surfaces near one end with transversely extended grooves forming external flanges, substantially as described. v u

4. An anti-chafing and strain relieving device of the character described comprising members havingin their innersurfaces longitudinally extended grooves and provided on their outersurfaces near one endwith transversely extended grooves forming ex-v ternal flanges; substantiallyras described.

p 5. The combination with *a metal shell. having atits end an opening through which electric conductors are passed of an antichafing and strain relieving device com: prising members capable of belng inserted. into said shell between the walls of the saidopening and "said conductors and provided with means of engaging the shell within the same, and means for securing together the ends of the members outside of said shell. I

In testimony whereof, -I have signed my name to this specification in the presence of two subscribing witnesses.

J OHAN M. ANDERSEN.

Witnesses: I

J AS. H. CHURCHILL, J. MURPHY. 

